Inverted DCI-P3 transform

dcip3

!<ColorSpace>
    name: dcip3
    family:
    equalitygroup:
    bitdepth: 16f
    description: |
      OpenDCP input LUT with DCI reference white and Gamma 2.6
    isdata: false
    allocation: uniform
    allocationvars: [0, 1]
    to_reference: !<GroupTransform>
      children:
        - !<FileTransform> {src: dci_xyz.spi1d, interpolation: linear, direction: inverse}
        - !<FileTransform> {src: srgb_to_xyz.spimtx, interpolation: linear, direction: inverse}